2148 lines
53 KiB
C
2148 lines
53 KiB
C
/*
|
||
* tclBinary.c --
|
||
*
|
||
* This file contains the implementation of the "binary" Tcl built-in
|
||
* command and the Tcl binary data object.
|
||
*
|
||
* Copyright (c) 1997 by Sun Microsystems, Inc.
|
||
* Copyright (c) 1998-1999 by Scriptics Corporation.
|
||
*
|
||
* See the file "license.terms" for information on usage and redistribution of
|
||
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
*/
|
||
|
||
#include "tclInt.h"
|
||
#include "tommath.h"
|
||
|
||
#include <math.h>
|
||
|
||
/*
|
||
* The following constants are used by GetFormatSpec to indicate various
|
||
* special conditions in the parsing of a format specifier.
|
||
*/
|
||
|
||
#define BINARY_ALL -1 /* Use all elements in the argument. */
|
||
#define BINARY_NOCOUNT -2 /* No count was specified in format. */
|
||
|
||
/*
|
||
* The following flags may be ORed together and returned by GetFormatSpec
|
||
*/
|
||
|
||
#define BINARY_SIGNED 0 /* Field to be read as signed data */
|
||
#define BINARY_UNSIGNED 1 /* Field to be read as unsigned data */
|
||
|
||
/*
|
||
* The following defines the maximum number of different (integer) numbers
|
||
* placed in the object cache by 'binary scan' before it bails out and
|
||
* switches back to Plan A (creating a new object for each value.)
|
||
* Theoretically, it would be possible to keep the cache about for the values
|
||
* that are already in it, but that makes the code slower in practise when
|
||
* overflow happens, and makes little odds the rest of the time (as measured
|
||
* on my machine.) It is also slower (on the sample I tried at least) to grow
|
||
* the cache to hold all items we might want to put in it; presumably the
|
||
* extra cost of managing the memory for the enlarged table outweighs the
|
||
* benefit from allocating fewer objects. This is probably because as the
|
||
* number of objects increases, the likelihood of reuse of any particular one
|
||
* drops, and there is very little gain from larger maximum cache sizes (the
|
||
* value below is chosen to allow caching to work in full with conversion of
|
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* bytes.) - DKF
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*/
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||
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||
#define BINARY_SCAN_MAX_CACHE 260
|
||
|
||
/*
|
||
* Prototypes for local procedures defined in this file:
|
||
*/
|
||
|
||
static void DupByteArrayInternalRep(Tcl_Obj *srcPtr,
|
||
Tcl_Obj *copyPtr);
|
||
static int FormatNumber(Tcl_Interp *interp, int type,
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Tcl_Obj *src, unsigned char **cursorPtr);
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||
static void FreeByteArrayInternalRep(Tcl_Obj *objPtr);
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||
static int GetFormatSpec(char **formatPtr, char *cmdPtr,
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int *countPtr, int *flagsPtr);
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static Tcl_Obj * ScanNumber(unsigned char *buffer, int type,
|
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int flags, Tcl_HashTable **numberCachePtr);
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static int SetByteArrayFromAny(Tcl_Interp *interp,
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Tcl_Obj *objPtr);
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||
static void UpdateStringOfByteArray(Tcl_Obj *listPtr);
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static void DeleteScanNumberCache(Tcl_HashTable *numberCachePtr);
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static int NeedReversing(int format);
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static void CopyNumber(const void *from, void *to,
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unsigned int length, int type);
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||
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/*
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* The following object type represents an array of bytes. An array of bytes
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* is not equivalent to an internationalized string. Conceptually, a string is
|
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* an array of 16-bit quantities organized as a sequence of properly formed
|
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* UTF-8 characters, while a ByteArray is an array of 8-bit quantities.
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* Accessor functions are provided to convert a ByteArray to a String or a
|
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* String to a ByteArray. Two or more consecutive bytes in an array of bytes
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* may look like a single UTF-8 character if the array is casually treated as
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* a string. But obtaining the String from a ByteArray is guaranteed to
|
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* produced properly formed UTF-8 sequences so that there is a one-to-one map
|
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* between bytes and characters.
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*
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* Converting a ByteArray to a String proceeds by casting each byte in the
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* array to a 16-bit quantity, treating that number as a Unicode character,
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* and storing the UTF-8 version of that Unicode character in the String. For
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* ByteArrays consisting entirely of values 1..127, the corresponding String
|
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* representation is the same as the ByteArray representation.
|
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*
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* Converting a String to a ByteArray proceeds by getting the Unicode
|
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* representation of each character in the String, casting it to a byte by
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* truncating the upper 8 bits, and then storing the byte in the ByteArray.
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* Converting from ByteArray to String and back to ByteArray is not lossy, but
|
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* converting an arbitrary String to a ByteArray may be.
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*/
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Tcl_ObjType tclByteArrayType = {
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"bytearray",
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FreeByteArrayInternalRep,
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DupByteArrayInternalRep,
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UpdateStringOfByteArray,
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SetByteArrayFromAny
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};
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/*
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* The following structure is the internal rep for a ByteArray object. Keeps
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* track of how much memory has been used and how much has been allocated for
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* the byte array to enable growing and shrinking of the ByteArray object with
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* fewer mallocs.
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*/
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typedef struct ByteArray {
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int used; /* The number of bytes used in the byte
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* array. */
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int allocated; /* The amount of space actually allocated
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* minus 1 byte. */
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unsigned char bytes[4]; /* The array of bytes. The actual size of this
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* field depends on the 'allocated' field
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* above. */
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} ByteArray;
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#define BYTEARRAY_SIZE(len) \
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((unsigned) (sizeof(ByteArray) - 4 + (len)))
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#define GET_BYTEARRAY(objPtr) \
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((ByteArray *) (objPtr)->internalRep.twoPtrValue.ptr1)
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#define SET_BYTEARRAY(objPtr, baPtr) \
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(objPtr)->internalRep.twoPtrValue.ptr1 = (VOID *) (baPtr)
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_NewByteArrayObj --
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*
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* This procedure is creates a new ByteArray object and initializes it
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* from the given array of bytes.
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*
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* Results:
|
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* The newly create object is returned. This object will have no initial
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* string representation. The returned object has a ref count of 0.
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*
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* Side effects:
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* Memory allocated for new object and copy of byte array argument.
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*
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*----------------------------------------------------------------------
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*/
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#ifdef TCL_MEM_DEBUG
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#undef Tcl_NewByteArrayObj
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Tcl_Obj *
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Tcl_NewByteArrayObj(
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const unsigned char *bytes, /* The array of bytes used to initialize the
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* new object. */
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int length) /* Length of the array of bytes, which must be
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* >= 0. */
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{
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return Tcl_DbNewByteArrayObj(bytes, length, "unknown", 0);
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}
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#else /* if not TCL_MEM_DEBUG */
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Tcl_Obj *
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Tcl_NewByteArrayObj(
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const unsigned char *bytes, /* The array of bytes used to initialize the
|
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* new object. */
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int length) /* Length of the array of bytes, which must be
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* >= 0. */
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{
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Tcl_Obj *objPtr;
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TclNewObj(objPtr);
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Tcl_SetByteArrayObj(objPtr, bytes, length);
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return objPtr;
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}
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#endif /* TCL_MEM_DEBUG */
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_DbNewByteArrayObj --
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*
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* This procedure is normally called when debugging: i.e., when
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* TCL_MEM_DEBUG is defined. It is the same as the Tcl_NewByteArrayObj
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* above except that it calls Tcl_DbCkalloc directly with the file name
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* and line number from its caller. This simplifies debugging since then
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* the [memory active] command will report the correct file name and line
|
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* number when reporting objects that haven't been freed.
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*
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* When TCL_MEM_DEBUG is not defined, this procedure just returns the
|
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* result of calling Tcl_NewByteArrayObj.
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*
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* Results:
|
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* The newly create object is returned. This object will have no initial
|
||
* string representation. The returned object has a ref count of 0.
|
||
*
|
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* Side effects:
|
||
* Memory allocated for new object and copy of byte array argument.
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||
*
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*----------------------------------------------------------------------
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||
*/
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#ifdef TCL_MEM_DEBUG
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Tcl_Obj *
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Tcl_DbNewByteArrayObj(
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const unsigned char *bytes, /* The array of bytes used to initialize the
|
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* new object. */
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int length, /* Length of the array of bytes, which must be
|
||
* >= 0. */
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||
const char *file, /* The name of the source file calling this
|
||
* procedure; used for debugging. */
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||
int line) /* Line number in the source file; used for
|
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* debugging. */
|
||
{
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Tcl_Obj *objPtr;
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TclDbNewObj(objPtr, file, line);
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Tcl_SetByteArrayObj(objPtr, bytes, length);
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return objPtr;
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}
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#else /* if not TCL_MEM_DEBUG */
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Tcl_Obj *
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Tcl_DbNewByteArrayObj(
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const unsigned char *bytes, /* The array of bytes used to initialize the
|
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* new object. */
|
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int length, /* Length of the array of bytes, which must be
|
||
* >= 0. */
|
||
const char *file, /* The name of the source file calling this
|
||
* procedure; used for debugging. */
|
||
int line) /* Line number in the source file; used for
|
||
* debugging. */
|
||
{
|
||
return Tcl_NewByteArrayObj(bytes, length);
|
||
}
|
||
#endif /* TCL_MEM_DEBUG */
|
||
|
||
/*
|
||
*---------------------------------------------------------------------------
|
||
*
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||
* Tcl_SetByteArrayObj --
|
||
*
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* Modify an object to be a ByteArray object and to have the specified
|
||
* array of bytes as its value.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The object's old string rep and internal rep is freed. Memory
|
||
* allocated for copy of byte array argument.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
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||
void
|
||
Tcl_SetByteArrayObj(
|
||
Tcl_Obj *objPtr, /* Object to initialize as a ByteArray. */
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const unsigned char *bytes, /* The array of bytes to use as the new
|
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* value. */
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int length) /* Length of the array of bytes, which must be
|
||
* >= 0. */
|
||
{
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||
ByteArray *byteArrayPtr;
|
||
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if (Tcl_IsShared(objPtr)) {
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||
Tcl_Panic("%s called with shared object", "Tcl_SetByteArrayObj");
|
||
}
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||
TclFreeIntRep(objPtr);
|
||
TclInvalidateStringRep(objPtr);
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||
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||
if (length < 0) {
|
||
length = 0;
|
||
}
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byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
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byteArrayPtr->used = length;
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byteArrayPtr->allocated = length;
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if ((bytes != NULL) && (length > 0)) {
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memcpy(byteArrayPtr->bytes, bytes, (size_t) length);
|
||
}
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objPtr->typePtr = &tclByteArrayType;
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SET_BYTEARRAY(objPtr, byteArrayPtr);
|
||
}
|
||
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||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tcl_GetByteArrayFromObj --
|
||
*
|
||
* Attempt to get the array of bytes from the Tcl object. If the object
|
||
* is not already a ByteArray object, an attempt will be made to convert
|
||
* it to one.
|
||
*
|
||
* Results:
|
||
* Pointer to array of bytes representing the ByteArray object.
|
||
*
|
||
* Side effects:
|
||
* Frees old internal rep. Allocates memory for new internal rep.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
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unsigned char *
|
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Tcl_GetByteArrayFromObj(
|
||
Tcl_Obj *objPtr, /* The ByteArray object. */
|
||
int *lengthPtr) /* If non-NULL, filled with length of the
|
||
* array of bytes in the ByteArray object. */
|
||
{
|
||
ByteArray *baPtr;
|
||
|
||
if (objPtr->typePtr != &tclByteArrayType) {
|
||
SetByteArrayFromAny(NULL, objPtr);
|
||
}
|
||
baPtr = GET_BYTEARRAY(objPtr);
|
||
|
||
if (lengthPtr != NULL) {
|
||
*lengthPtr = baPtr->used;
|
||
}
|
||
return (unsigned char *) baPtr->bytes;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tcl_SetByteArrayLength --
|
||
*
|
||
* This procedure changes the length of the byte array for this object.
|
||
* Once the caller has set the length of the array, it is acceptable to
|
||
* directly modify the bytes in the array up until Tcl_GetStringFromObj()
|
||
* has been called on this object.
|
||
*
|
||
* Results:
|
||
* The new byte array of the specified length.
|
||
*
|
||
* Side effects:
|
||
* Allocates enough memory for an array of bytes of the requested size.
|
||
* When growing the array, the old array is copied to the new array; new
|
||
* bytes are undefined. When shrinking, the old array is truncated to the
|
||
* specified length.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
unsigned char *
|
||
Tcl_SetByteArrayLength(
|
||
Tcl_Obj *objPtr, /* The ByteArray object. */
|
||
int length) /* New length for internal byte array. */
|
||
{
|
||
ByteArray *byteArrayPtr;
|
||
|
||
if (Tcl_IsShared(objPtr)) {
|
||
Tcl_Panic("%s called with shared object", "Tcl_SetByteArrayLength");
|
||
}
|
||
if (objPtr->typePtr != &tclByteArrayType) {
|
||
SetByteArrayFromAny(NULL, objPtr);
|
||
}
|
||
|
||
byteArrayPtr = GET_BYTEARRAY(objPtr);
|
||
if (length > byteArrayPtr->allocated) {
|
||
byteArrayPtr = (ByteArray *) ckrealloc(
|
||
(char *) byteArrayPtr, BYTEARRAY_SIZE(length));
|
||
byteArrayPtr->allocated = length;
|
||
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
||
}
|
||
TclInvalidateStringRep(objPtr);
|
||
byteArrayPtr->used = length;
|
||
return byteArrayPtr->bytes;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* SetByteArrayFromAny --
|
||
*
|
||
* Generate the ByteArray internal rep from the string rep.
|
||
*
|
||
* Results:
|
||
* The return value is always TCL_OK.
|
||
*
|
||
* Side effects:
|
||
* A ByteArray object is stored as the internal rep of objPtr.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
SetByteArrayFromAny(
|
||
Tcl_Interp *interp, /* Not used. */
|
||
Tcl_Obj *objPtr) /* The object to convert to type ByteArray. */
|
||
{
|
||
int length;
|
||
char *src, *srcEnd;
|
||
unsigned char *dst;
|
||
ByteArray *byteArrayPtr;
|
||
Tcl_UniChar ch;
|
||
|
||
if (objPtr->typePtr != &tclByteArrayType) {
|
||
src = TclGetStringFromObj(objPtr, &length);
|
||
srcEnd = src + length;
|
||
|
||
byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
||
for (dst = byteArrayPtr->bytes; src < srcEnd; ) {
|
||
src += Tcl_UtfToUniChar(src, &ch);
|
||
*dst++ = (unsigned char) ch;
|
||
}
|
||
|
||
byteArrayPtr->used = dst - byteArrayPtr->bytes;
|
||
byteArrayPtr->allocated = length;
|
||
|
||
TclFreeIntRep(objPtr);
|
||
objPtr->typePtr = &tclByteArrayType;
|
||
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FreeByteArrayInternalRep --
|
||
*
|
||
* Deallocate the storage associated with a ByteArray data object's
|
||
* internal representation.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Frees memory.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
FreeByteArrayInternalRep(
|
||
Tcl_Obj *objPtr) /* Object with internal rep to free. */
|
||
{
|
||
ckfree((char *) GET_BYTEARRAY(objPtr));
|
||
objPtr->typePtr = NULL;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DupByteArrayInternalRep --
|
||
*
|
||
* Initialize the internal representation of a ByteArray Tcl_Obj to a
|
||
* copy of the internal representation of an existing ByteArray object.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Allocates memory.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DupByteArrayInternalRep(
|
||
Tcl_Obj *srcPtr, /* Object with internal rep to copy. */
|
||
Tcl_Obj *copyPtr) /* Object with internal rep to set. */
|
||
{
|
||
int length;
|
||
ByteArray *srcArrayPtr, *copyArrayPtr;
|
||
|
||
srcArrayPtr = GET_BYTEARRAY(srcPtr);
|
||
length = srcArrayPtr->used;
|
||
|
||
copyArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
|
||
copyArrayPtr->used = length;
|
||
copyArrayPtr->allocated = length;
|
||
memcpy(copyArrayPtr->bytes, srcArrayPtr->bytes, (size_t) length);
|
||
SET_BYTEARRAY(copyPtr, copyArrayPtr);
|
||
|
||
copyPtr->typePtr = &tclByteArrayType;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* UpdateStringOfByteArray --
|
||
*
|
||
* Update the string representation for a ByteArray data object. Note:
|
||
* This procedure does not invalidate an existing old string rep so
|
||
* storage will be lost if this has not already been done.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The object's string is set to a valid string that results from the
|
||
* ByteArray-to-string conversion.
|
||
*
|
||
* The object becomes a string object -- the internal rep is discarded
|
||
* and the typePtr becomes NULL.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
UpdateStringOfByteArray(
|
||
Tcl_Obj *objPtr) /* ByteArray object whose string rep to
|
||
* update. */
|
||
{
|
||
int i, length, size;
|
||
unsigned char *src;
|
||
char *dst;
|
||
ByteArray *byteArrayPtr;
|
||
|
||
byteArrayPtr = GET_BYTEARRAY(objPtr);
|
||
src = byteArrayPtr->bytes;
|
||
length = byteArrayPtr->used;
|
||
|
||
/*
|
||
* How much space will string rep need?
|
||
*/
|
||
|
||
size = length;
|
||
for (i = 0; i < length && size >= 0; i++) {
|
||
if ((src[i] == 0) || (src[i] > 127)) {
|
||
size++;
|
||
}
|
||
}
|
||
if (size < 0) {
|
||
Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX);
|
||
}
|
||
|
||
dst = (char *) ckalloc((unsigned) (size + 1));
|
||
objPtr->bytes = dst;
|
||
objPtr->length = size;
|
||
|
||
if (size == length) {
|
||
memcpy(dst, src, (size_t) size);
|
||
dst[size] = '\0';
|
||
} else {
|
||
for (i = 0; i < length; i++) {
|
||
dst += Tcl_UniCharToUtf(src[i], dst);
|
||
}
|
||
*dst = '\0';
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TclAppendBytesToByteArray --
|
||
*
|
||
* This function appends an array of bytes to a byte array object. Note
|
||
* that the object *must* be unshared, and the array of bytes *must not*
|
||
* refer to the object being appended to.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Allocates enough memory for an array of bytes of the requested total
|
||
* size, or possibly larger. [Bug 2992970]
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
#define TCL_MIN_GROWTH 1024
|
||
void
|
||
TclAppendBytesToByteArray(
|
||
Tcl_Obj *objPtr,
|
||
const unsigned char *bytes,
|
||
int len)
|
||
{
|
||
ByteArray *byteArrayPtr;
|
||
int needed;
|
||
|
||
if (Tcl_IsShared(objPtr)) {
|
||
Tcl_Panic("%s called with shared object","TclAppendBytesToByteArray");
|
||
}
|
||
if (len < 0) {
|
||
Tcl_Panic("%s must be called with definite number of bytes to append",
|
||
"TclAppendBytesToByteArray");
|
||
}
|
||
if (len == 0) {
|
||
/* Append zero bytes is a no-op. */
|
||
return;
|
||
}
|
||
if (objPtr->typePtr != &tclByteArrayType) {
|
||
SetByteArrayFromAny(NULL, objPtr);
|
||
}
|
||
byteArrayPtr = GET_BYTEARRAY(objPtr);
|
||
|
||
if (len > INT_MAX - byteArrayPtr->used) {
|
||
Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX);
|
||
}
|
||
|
||
needed = byteArrayPtr->used + len;
|
||
/*
|
||
* If we need to, resize the allocated space in the byte array.
|
||
*/
|
||
|
||
if (needed > byteArrayPtr->allocated) {
|
||
ByteArray *ptr = NULL;
|
||
int attempt;
|
||
|
||
if (needed <= INT_MAX/2) {
|
||
/* Try to allocate double the total space that is needed. */
|
||
attempt = 2 * needed;
|
||
ptr = (ByteArray *) attemptckrealloc((void *) byteArrayPtr,
|
||
BYTEARRAY_SIZE(attempt));
|
||
}
|
||
if (ptr == NULL) {
|
||
/* Try to allocate double the increment that is needed (plus). */
|
||
unsigned int limit = INT_MAX - needed;
|
||
unsigned int extra = len + TCL_MIN_GROWTH;
|
||
int growth = (int) ((extra > limit) ? limit : extra);
|
||
|
||
attempt = needed + growth;
|
||
ptr = (ByteArray *) attemptckrealloc((void *) byteArrayPtr,
|
||
BYTEARRAY_SIZE(attempt));
|
||
}
|
||
if (ptr == NULL) {
|
||
/* Last chance: Try to allocate exactly what is needed. */
|
||
attempt = needed;
|
||
ptr = (ByteArray *) ckrealloc((void *)byteArrayPtr,
|
||
BYTEARRAY_SIZE(attempt));
|
||
}
|
||
byteArrayPtr = ptr;
|
||
byteArrayPtr->allocated = attempt;
|
||
SET_BYTEARRAY(objPtr, byteArrayPtr);
|
||
}
|
||
|
||
if (bytes) {
|
||
memcpy(byteArrayPtr->bytes + byteArrayPtr->used, bytes, len);
|
||
}
|
||
byteArrayPtr->used += len;
|
||
TclInvalidateStringRep(objPtr);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tcl_BinaryObjCmd --
|
||
*
|
||
* This procedure implements the "binary" Tcl command.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
Tcl_BinaryObjCmd(
|
||
ClientData dummy, /* Not used. */
|
||
Tcl_Interp *interp, /* Current interpreter. */
|
||
int objc, /* Number of arguments. */
|
||
Tcl_Obj *const objv[]) /* Argument objects. */
|
||
{
|
||
int arg; /* Index of next argument to consume. */
|
||
int value = 0; /* Current integer value to be packed.
|
||
* Initialized to avoid compiler warning. */
|
||
char cmd; /* Current format character. */
|
||
int count; /* Count associated with current format
|
||
* character. */
|
||
int flags; /* Format field flags */
|
||
char *format; /* Pointer to current position in format
|
||
* string. */
|
||
Tcl_Obj *resultPtr = NULL; /* Object holding result buffer. */
|
||
unsigned char *buffer; /* Start of result buffer. */
|
||
unsigned char *cursor; /* Current position within result buffer. */
|
||
unsigned char *maxPos; /* Greatest position within result buffer that
|
||
* cursor has visited.*/
|
||
const char *errorString;
|
||
char *errorValue, *str;
|
||
int offset, size, length, index;
|
||
static const char *options[] = {
|
||
"format", "scan", NULL
|
||
};
|
||
enum options {
|
||
BINARY_FORMAT, BINARY_SCAN
|
||
};
|
||
|
||
if (objc < 2) {
|
||
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0,
|
||
&index) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
switch ((enum options) index) {
|
||
case BINARY_FORMAT:
|
||
if (objc < 3) {
|
||
Tcl_WrongNumArgs(interp, 2, objv, "formatString ?arg arg ...?");
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* To avoid copying the data, we format the string in two passes. The
|
||
* first pass computes the size of the output buffer. The second pass
|
||
* places the formatted data into the buffer.
|
||
*/
|
||
|
||
format = TclGetString(objv[2]);
|
||
arg = 3;
|
||
offset = 0;
|
||
length = 0;
|
||
while (*format != '\0') {
|
||
str = format;
|
||
flags = 0;
|
||
if (!GetFormatSpec(&format, &cmd, &count, &flags)) {
|
||
break;
|
||
}
|
||
switch (cmd) {
|
||
case 'a':
|
||
case 'A':
|
||
case 'b':
|
||
case 'B':
|
||
case 'h':
|
||
case 'H':
|
||
/*
|
||
* For string-type specifiers, the count corresponds to the
|
||
* number of bytes in a single argument.
|
||
*/
|
||
|
||
if (arg >= objc) {
|
||
goto badIndex;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
Tcl_GetByteArrayFromObj(objv[arg], &count);
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
arg++;
|
||
if (cmd == 'a' || cmd == 'A') {
|
||
offset += count;
|
||
} else if (cmd == 'b' || cmd == 'B') {
|
||
offset += (count + 7) / 8;
|
||
} else {
|
||
offset += (count + 1) / 2;
|
||
}
|
||
break;
|
||
case 'c':
|
||
size = 1;
|
||
goto doNumbers;
|
||
case 't':
|
||
case 's':
|
||
case 'S':
|
||
size = 2;
|
||
goto doNumbers;
|
||
case 'n':
|
||
case 'i':
|
||
case 'I':
|
||
size = 4;
|
||
goto doNumbers;
|
||
case 'm':
|
||
case 'w':
|
||
case 'W':
|
||
size = 8;
|
||
goto doNumbers;
|
||
case 'r':
|
||
case 'R':
|
||
case 'f':
|
||
size = sizeof(float);
|
||
goto doNumbers;
|
||
case 'q':
|
||
case 'Q':
|
||
case 'd':
|
||
size = sizeof(double);
|
||
|
||
doNumbers:
|
||
if (arg >= objc) {
|
||
goto badIndex;
|
||
}
|
||
|
||
/*
|
||
* For number-type specifiers, the count corresponds to the
|
||
* number of elements in the list stored in a single argument.
|
||
* If no count is specified, then the argument is taken as a
|
||
* single non-list value.
|
||
*/
|
||
|
||
if (count == BINARY_NOCOUNT) {
|
||
arg++;
|
||
count = 1;
|
||
} else {
|
||
int listc;
|
||
Tcl_Obj **listv;
|
||
|
||
/* The macro evals its args more than once: avoid arg++ */
|
||
if (TclListObjGetElements(interp, objv[arg], &listc,
|
||
&listv) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
arg++;
|
||
|
||
if (count == BINARY_ALL) {
|
||
count = listc;
|
||
} else if (count > listc) {
|
||
Tcl_AppendResult(interp,
|
||
"number of elements in list does not match count",
|
||
NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
}
|
||
offset += count*size;
|
||
break;
|
||
|
||
case 'x':
|
||
if (count == BINARY_ALL) {
|
||
Tcl_AppendResult(interp,
|
||
"cannot use \"*\" in format string with \"x\"",
|
||
NULL);
|
||
return TCL_ERROR;
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
offset += count;
|
||
break;
|
||
case 'X':
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if ((count > offset) || (count == BINARY_ALL)) {
|
||
count = offset;
|
||
}
|
||
if (offset > length) {
|
||
length = offset;
|
||
}
|
||
offset -= count;
|
||
break;
|
||
case '@':
|
||
if (offset > length) {
|
||
length = offset;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
offset = length;
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
goto badCount;
|
||
} else {
|
||
offset = count;
|
||
}
|
||
break;
|
||
default:
|
||
errorString = str;
|
||
goto badField;
|
||
}
|
||
}
|
||
if (offset > length) {
|
||
length = offset;
|
||
}
|
||
if (length == 0) {
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Prepare the result object by preallocating the caclulated number of
|
||
* bytes and filling with nulls.
|
||
*/
|
||
|
||
resultPtr = Tcl_NewObj();
|
||
buffer = Tcl_SetByteArrayLength(resultPtr, length);
|
||
memset(buffer, 0, (size_t) length);
|
||
|
||
/*
|
||
* Pack the data into the result object. Note that we can skip the
|
||
* error checking during this pass, since we have already parsed the
|
||
* string once.
|
||
*/
|
||
|
||
arg = 3;
|
||
format = TclGetString(objv[2]);
|
||
cursor = buffer;
|
||
maxPos = cursor;
|
||
while (*format != 0) {
|
||
flags = 0;
|
||
if (!GetFormatSpec(&format, &cmd, &count, &flags)) {
|
||
break;
|
||
}
|
||
if ((count == 0) && (cmd != '@')) {
|
||
if (cmd != 'x') {
|
||
arg++;
|
||
}
|
||
continue;
|
||
}
|
||
switch (cmd) {
|
||
case 'a':
|
||
case 'A': {
|
||
char pad = (char) (cmd == 'a' ? '\0' : ' ');
|
||
unsigned char *bytes;
|
||
|
||
bytes = Tcl_GetByteArrayFromObj(objv[arg++], &length);
|
||
|
||
if (count == BINARY_ALL) {
|
||
count = length;
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if (length >= count) {
|
||
memcpy(cursor, bytes, (size_t) count);
|
||
} else {
|
||
memcpy(cursor, bytes, (size_t) length);
|
||
memset(cursor + length, pad, (size_t) (count - length));
|
||
}
|
||
cursor += count;
|
||
break;
|
||
}
|
||
case 'b':
|
||
case 'B': {
|
||
unsigned char *last;
|
||
|
||
str = TclGetStringFromObj(objv[arg], &length);
|
||
arg++;
|
||
if (count == BINARY_ALL) {
|
||
count = length;
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
last = cursor + ((count + 7) / 8);
|
||
if (count > length) {
|
||
count = length;
|
||
}
|
||
value = 0;
|
||
errorString = "binary";
|
||
if (cmd == 'B') {
|
||
for (offset = 0; offset < count; offset++) {
|
||
value <<= 1;
|
||
if (str[offset] == '1') {
|
||
value |= 1;
|
||
} else if (str[offset] != '0') {
|
||
errorValue = str;
|
||
Tcl_DecrRefCount(resultPtr);
|
||
goto badValue;
|
||
}
|
||
if (((offset + 1) % 8) == 0) {
|
||
*cursor++ = (unsigned char) value;
|
||
value = 0;
|
||
}
|
||
}
|
||
} else {
|
||
for (offset = 0; offset < count; offset++) {
|
||
value >>= 1;
|
||
if (str[offset] == '1') {
|
||
value |= 128;
|
||
} else if (str[offset] != '0') {
|
||
errorValue = str;
|
||
Tcl_DecrRefCount(resultPtr);
|
||
goto badValue;
|
||
}
|
||
if (!((offset + 1) % 8)) {
|
||
*cursor++ = (unsigned char) value;
|
||
value = 0;
|
||
}
|
||
}
|
||
}
|
||
if ((offset % 8) != 0) {
|
||
if (cmd == 'B') {
|
||
value <<= 8 - (offset % 8);
|
||
} else {
|
||
value >>= 8 - (offset % 8);
|
||
}
|
||
*cursor++ = (unsigned char) value;
|
||
}
|
||
while (cursor < last) {
|
||
*cursor++ = '\0';
|
||
}
|
||
break;
|
||
}
|
||
case 'h':
|
||
case 'H': {
|
||
unsigned char *last;
|
||
int c;
|
||
|
||
str = TclGetStringFromObj(objv[arg], &length);
|
||
arg++;
|
||
if (count == BINARY_ALL) {
|
||
count = length;
|
||
} else if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
last = cursor + ((count + 1) / 2);
|
||
if (count > length) {
|
||
count = length;
|
||
}
|
||
value = 0;
|
||
errorString = "hexadecimal";
|
||
if (cmd == 'H') {
|
||
for (offset = 0; offset < count; offset++) {
|
||
value <<= 4;
|
||
if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */
|
||
errorValue = str;
|
||
Tcl_DecrRefCount(resultPtr);
|
||
goto badValue;
|
||
}
|
||
c = str[offset] - '0';
|
||
if (c > 9) {
|
||
c += ('0' - 'A') + 10;
|
||
}
|
||
if (c > 16) {
|
||
c += ('A' - 'a');
|
||
}
|
||
value |= (c & 0xf);
|
||
if (offset % 2) {
|
||
*cursor++ = (char) value;
|
||
value = 0;
|
||
}
|
||
}
|
||
} else {
|
||
for (offset = 0; offset < count; offset++) {
|
||
value >>= 4;
|
||
|
||
if (!isxdigit(UCHAR(str[offset]))) { /* INTL: digit */
|
||
errorValue = str;
|
||
Tcl_DecrRefCount(resultPtr);
|
||
goto badValue;
|
||
}
|
||
c = str[offset] - '0';
|
||
if (c > 9) {
|
||
c += ('0' - 'A') + 10;
|
||
}
|
||
if (c > 16) {
|
||
c += ('A' - 'a');
|
||
}
|
||
value |= ((c << 4) & 0xf0);
|
||
if (offset % 2) {
|
||
*cursor++ = (unsigned char)(value & 0xff);
|
||
value = 0;
|
||
}
|
||
}
|
||
}
|
||
if (offset % 2) {
|
||
if (cmd == 'H') {
|
||
value <<= 4;
|
||
} else {
|
||
value >>= 4;
|
||
}
|
||
*cursor++ = (unsigned char) value;
|
||
}
|
||
|
||
while (cursor < last) {
|
||
*cursor++ = '\0';
|
||
}
|
||
break;
|
||
}
|
||
case 'c':
|
||
case 't':
|
||
case 's':
|
||
case 'S':
|
||
case 'n':
|
||
case 'i':
|
||
case 'I':
|
||
case 'm':
|
||
case 'w':
|
||
case 'W':
|
||
case 'r':
|
||
case 'R':
|
||
case 'd':
|
||
case 'q':
|
||
case 'Q':
|
||
case 'f': {
|
||
int listc, i;
|
||
Tcl_Obj **listv;
|
||
|
||
if (count == BINARY_NOCOUNT) {
|
||
/*
|
||
* Note that we are casting away the const-ness of objv,
|
||
* but this is safe since we aren't going to modify the
|
||
* array.
|
||
*/
|
||
|
||
listv = (Tcl_Obj**)(objv + arg);
|
||
listc = 1;
|
||
count = 1;
|
||
} else {
|
||
TclListObjGetElements(interp, objv[arg], &listc, &listv);
|
||
if (count == BINARY_ALL) {
|
||
count = listc;
|
||
}
|
||
}
|
||
arg++;
|
||
for (i = 0; i < count; i++) {
|
||
if (FormatNumber(interp, cmd, listv[i], &cursor)!=TCL_OK) {
|
||
Tcl_DecrRefCount(resultPtr);
|
||
return TCL_ERROR;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
case 'x':
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
memset(cursor, 0, (size_t) count);
|
||
cursor += count;
|
||
break;
|
||
case 'X':
|
||
if (cursor > maxPos) {
|
||
maxPos = cursor;
|
||
}
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if ((count == BINARY_ALL) || (count > (cursor - buffer))) {
|
||
cursor = buffer;
|
||
} else {
|
||
cursor -= count;
|
||
}
|
||
break;
|
||
case '@':
|
||
if (cursor > maxPos) {
|
||
maxPos = cursor;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
cursor = maxPos;
|
||
} else {
|
||
cursor = buffer + count;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
Tcl_SetObjResult(interp, resultPtr);
|
||
break;
|
||
case BINARY_SCAN: {
|
||
int i;
|
||
Tcl_Obj *valuePtr, *elementPtr;
|
||
Tcl_HashTable numberCacheHash;
|
||
Tcl_HashTable *numberCachePtr;
|
||
|
||
if (objc < 4) {
|
||
Tcl_WrongNumArgs(interp, 2, objv,
|
||
"value formatString ?varName varName ...?");
|
||
return TCL_ERROR;
|
||
}
|
||
numberCachePtr = &numberCacheHash;
|
||
Tcl_InitHashTable(numberCachePtr, TCL_ONE_WORD_KEYS);
|
||
buffer = Tcl_GetByteArrayFromObj(objv[2], &length);
|
||
format = TclGetString(objv[3]);
|
||
cursor = buffer;
|
||
arg = 4;
|
||
offset = 0;
|
||
while (*format != '\0') {
|
||
str = format;
|
||
flags = 0;
|
||
if (!GetFormatSpec(&format, &cmd, &count, &flags)) {
|
||
goto done;
|
||
}
|
||
switch (cmd) {
|
||
case 'a':
|
||
case 'A': {
|
||
unsigned char *src;
|
||
|
||
if (arg >= objc) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
goto badIndex;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
count = length - offset;
|
||
} else {
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if (count > (length - offset)) {
|
||
goto done;
|
||
}
|
||
}
|
||
|
||
src = buffer + offset;
|
||
size = count;
|
||
|
||
/*
|
||
* Trim trailing nulls and spaces, if necessary.
|
||
*/
|
||
|
||
if (cmd == 'A') {
|
||
while (size > 0) {
|
||
if (src[size-1] != '\0' && src[size-1] != ' ') {
|
||
break;
|
||
}
|
||
size--;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Have to do this #ifdef-fery because (as part of defining
|
||
* Tcl_NewByteArrayObj) we removed the #def that hides this
|
||
* stuff normally. If this code ever gets copied to another
|
||
* file, it should be changed back to the simpler version.
|
||
*/
|
||
|
||
#ifdef TCL_MEM_DEBUG
|
||
valuePtr = Tcl_DbNewByteArrayObj(src, size, __FILE__,__LINE__);
|
||
#else
|
||
valuePtr = Tcl_NewByteArrayObj(src, size);
|
||
#endif /* TCL_MEM_DEBUG */
|
||
|
||
resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr,
|
||
TCL_LEAVE_ERR_MSG);
|
||
arg++;
|
||
if (resultPtr == NULL) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
return TCL_ERROR;
|
||
}
|
||
offset += count;
|
||
break;
|
||
}
|
||
case 'b':
|
||
case 'B': {
|
||
unsigned char *src;
|
||
char *dest;
|
||
|
||
if (arg >= objc) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
goto badIndex;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
count = (length - offset) * 8;
|
||
} else {
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if (count > (length - offset) * 8) {
|
||
goto done;
|
||
}
|
||
}
|
||
src = buffer + offset;
|
||
valuePtr = Tcl_NewObj();
|
||
Tcl_SetObjLength(valuePtr, count);
|
||
dest = TclGetString(valuePtr);
|
||
|
||
if (cmd == 'b') {
|
||
for (i = 0; i < count; i++) {
|
||
if (i % 8) {
|
||
value >>= 1;
|
||
} else {
|
||
value = *src++;
|
||
}
|
||
*dest++ = (char) ((value & 1) ? '1' : '0');
|
||
}
|
||
} else {
|
||
for (i = 0; i < count; i++) {
|
||
if (i % 8) {
|
||
value <<= 1;
|
||
} else {
|
||
value = *src++;
|
||
}
|
||
*dest++ = (char) ((value & 0x80) ? '1' : '0');
|
||
}
|
||
}
|
||
|
||
resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr,
|
||
TCL_LEAVE_ERR_MSG);
|
||
arg++;
|
||
if (resultPtr == NULL) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
return TCL_ERROR;
|
||
}
|
||
offset += (count + 7) / 8;
|
||
break;
|
||
}
|
||
case 'h':
|
||
case 'H': {
|
||
char *dest;
|
||
unsigned char *src;
|
||
int i;
|
||
static const char hexdigit[] = "0123456789abcdef";
|
||
|
||
if (arg >= objc) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
goto badIndex;
|
||
}
|
||
if (count == BINARY_ALL) {
|
||
count = (length - offset)*2;
|
||
} else {
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if (count > (length - offset)*2) {
|
||
goto done;
|
||
}
|
||
}
|
||
src = buffer + offset;
|
||
valuePtr = Tcl_NewObj();
|
||
Tcl_SetObjLength(valuePtr, count);
|
||
dest = TclGetString(valuePtr);
|
||
|
||
if (cmd == 'h') {
|
||
for (i = 0; i < count; i++) {
|
||
if (i % 2) {
|
||
value >>= 4;
|
||
} else {
|
||
value = *src++;
|
||
}
|
||
*dest++ = hexdigit[value & 0xf];
|
||
}
|
||
} else {
|
||
for (i = 0; i < count; i++) {
|
||
if (i % 2) {
|
||
value <<= 4;
|
||
} else {
|
||
value = *src++;
|
||
}
|
||
*dest++ = hexdigit[(value >> 4) & 0xf];
|
||
}
|
||
}
|
||
|
||
resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr,
|
||
TCL_LEAVE_ERR_MSG);
|
||
arg++;
|
||
if (resultPtr == NULL) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
return TCL_ERROR;
|
||
}
|
||
offset += (count + 1) / 2;
|
||
break;
|
||
}
|
||
case 'c':
|
||
size = 1;
|
||
goto scanNumber;
|
||
case 't':
|
||
case 's':
|
||
case 'S':
|
||
size = 2;
|
||
goto scanNumber;
|
||
case 'n':
|
||
case 'i':
|
||
case 'I':
|
||
size = 4;
|
||
goto scanNumber;
|
||
case 'm':
|
||
case 'w':
|
||
case 'W':
|
||
size = 8;
|
||
goto scanNumber;
|
||
case 'r':
|
||
case 'R':
|
||
case 'f':
|
||
size = sizeof(float);
|
||
goto scanNumber;
|
||
case 'q':
|
||
case 'Q':
|
||
case 'd': {
|
||
unsigned char *src;
|
||
|
||
size = sizeof(double);
|
||
/* fall through */
|
||
|
||
scanNumber:
|
||
if (arg >= objc) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
goto badIndex;
|
||
}
|
||
if (count == BINARY_NOCOUNT) {
|
||
if ((length - offset) < size) {
|
||
goto done;
|
||
}
|
||
valuePtr = ScanNumber(buffer+offset, cmd, flags,
|
||
&numberCachePtr);
|
||
offset += size;
|
||
} else {
|
||
if (count == BINARY_ALL) {
|
||
count = (length - offset) / size;
|
||
}
|
||
if ((length - offset) < (count * size)) {
|
||
goto done;
|
||
}
|
||
valuePtr = Tcl_NewObj();
|
||
src = buffer+offset;
|
||
for (i = 0; i < count; i++) {
|
||
elementPtr = ScanNumber(src, cmd, flags,
|
||
&numberCachePtr);
|
||
src += size;
|
||
Tcl_ListObjAppendElement(NULL, valuePtr, elementPtr);
|
||
}
|
||
offset += count*size;
|
||
}
|
||
|
||
resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr,
|
||
TCL_LEAVE_ERR_MSG);
|
||
arg++;
|
||
if (resultPtr == NULL) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
return TCL_ERROR;
|
||
}
|
||
break;
|
||
}
|
||
case 'x':
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if ((count == BINARY_ALL) || (count > (length - offset))) {
|
||
offset = length;
|
||
} else {
|
||
offset += count;
|
||
}
|
||
break;
|
||
case 'X':
|
||
if (count == BINARY_NOCOUNT) {
|
||
count = 1;
|
||
}
|
||
if ((count == BINARY_ALL) || (count > offset)) {
|
||
offset = 0;
|
||
} else {
|
||
offset -= count;
|
||
}
|
||
break;
|
||
case '@':
|
||
if (count == BINARY_NOCOUNT) {
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
goto badCount;
|
||
}
|
||
if ((count == BINARY_ALL) || (count > length)) {
|
||
offset = length;
|
||
} else {
|
||
offset = count;
|
||
}
|
||
break;
|
||
default:
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
errorString = str;
|
||
goto badField;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Set the result to the last position of the cursor.
|
||
*/
|
||
|
||
done:
|
||
Tcl_SetObjResult(interp, Tcl_NewLongObj(arg - 4));
|
||
DeleteScanNumberCache(numberCachePtr);
|
||
break;
|
||
}
|
||
}
|
||
return TCL_OK;
|
||
|
||
badValue:
|
||
Tcl_ResetResult(interp);
|
||
Tcl_AppendResult(interp, "expected ", errorString,
|
||
" string but got \"", errorValue, "\" instead", NULL);
|
||
return TCL_ERROR;
|
||
|
||
badCount:
|
||
errorString = "missing count for \"@\" field specifier";
|
||
goto error;
|
||
|
||
badIndex:
|
||
errorString = "not enough arguments for all format specifiers";
|
||
goto error;
|
||
|
||
badField:
|
||
{
|
||
Tcl_UniChar ch;
|
||
char buf[TCL_UTF_MAX + 1];
|
||
|
||
Tcl_UtfToUniChar(errorString, &ch);
|
||
buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
|
||
Tcl_AppendResult(interp, "bad field specifier \"", buf, "\"", NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
error:
|
||
Tcl_AppendResult(interp, errorString, NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* GetFormatSpec --
|
||
*
|
||
* This function parses the format strings used in the binary format and
|
||
* scan commands.
|
||
*
|
||
* Results:
|
||
* Moves the formatPtr to the start of the next command. Returns the
|
||
* current command character and count in cmdPtr and countPtr. The count
|
||
* is set to BINARY_ALL if the count character was '*' or BINARY_NOCOUNT
|
||
* if no count was specified. Returns 1 on success, or 0 if the string
|
||
* did not have a format specifier.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
GetFormatSpec(
|
||
char **formatPtr, /* Pointer to format string. */
|
||
char *cmdPtr, /* Pointer to location of command char. */
|
||
int *countPtr, /* Pointer to repeat count value. */
|
||
int *flagsPtr) /* Pointer to field flags */
|
||
{
|
||
/*
|
||
* Skip any leading blanks.
|
||
*/
|
||
|
||
while (**formatPtr == ' ') {
|
||
(*formatPtr)++;
|
||
}
|
||
|
||
/*
|
||
* The string was empty, except for whitespace, so fail.
|
||
*/
|
||
|
||
if (!(**formatPtr)) {
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Extract the command character and any trailing digits or '*'.
|
||
*/
|
||
|
||
*cmdPtr = **formatPtr;
|
||
(*formatPtr)++;
|
||
if (**formatPtr == 'u') {
|
||
(*formatPtr)++;
|
||
(*flagsPtr) |= BINARY_UNSIGNED;
|
||
}
|
||
if (**formatPtr == '*') {
|
||
(*formatPtr)++;
|
||
(*countPtr) = BINARY_ALL;
|
||
} else if (isdigit(UCHAR(**formatPtr))) { /* INTL: digit */
|
||
(*countPtr) = strtoul(*formatPtr, formatPtr, 10);
|
||
} else {
|
||
(*countPtr) = BINARY_NOCOUNT;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* NeedReversing --
|
||
*
|
||
* This routine determines, if bytes of a number need to be re-ordered,
|
||
* and returns a numeric code indicating the re-ordering to be done.
|
||
* This depends on the endiannes of the machine and the desired format.
|
||
* It is in effect a table (whose contents depend on the endianness of
|
||
* the system) describing whether a value needs reversing or not. Anyone
|
||
* porting the code to a big-endian platform should take care to make
|
||
* sure that they define WORDS_BIGENDIAN though this is already done by
|
||
* configure for the Unix build; little-endian platforms (including
|
||
* Windows) don't need to do anything.
|
||
*
|
||
* Results:
|
||
* 0 No re-ordering needed.
|
||
* 1 Reverse the bytes: 01234567 <-> 76543210 (little to big)
|
||
* 2 Apply this re-ordering: 01234567 <-> 45670123 (Nokia to little)
|
||
* 3 Apply this re-ordering: 01234567 <-> 32107654 (Nokia to big)
|
||
*
|
||
* Side effects:
|
||
* None
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
NeedReversing(
|
||
int format)
|
||
{
|
||
switch (format) {
|
||
/* native floats and doubles: never reverse */
|
||
case 'd':
|
||
case 'f':
|
||
/* big endian ints: never reverse */
|
||
case 'I':
|
||
case 'S':
|
||
case 'W':
|
||
#ifdef WORDS_BIGENDIAN
|
||
/* native ints: reverse if we're little-endian */
|
||
case 'n':
|
||
case 't':
|
||
case 'm':
|
||
/* f: reverse if we're little-endian */
|
||
case 'Q':
|
||
case 'R':
|
||
#else /* !WORDS_BIGENDIAN */
|
||
/* small endian floats: reverse if we're big-endian */
|
||
case 'r':
|
||
#endif /* WORDS_BIGENDIAN */
|
||
return 0;
|
||
|
||
#ifdef WORDS_BIGENDIAN
|
||
/* small endian floats: reverse if we're big-endian */
|
||
case 'q':
|
||
case 'r':
|
||
#else /* !WORDS_BIGENDIAN */
|
||
/* native ints: reverse if we're little-endian */
|
||
case 'n':
|
||
case 't':
|
||
case 'm':
|
||
/* f: reverse if we're little-endian */
|
||
case 'R':
|
||
#endif /* WORDS_BIGENDIAN */
|
||
/* small endian ints: always reverse */
|
||
case 'i':
|
||
case 's':
|
||
case 'w':
|
||
return 1;
|
||
|
||
#ifndef WORDS_BIGENDIAN
|
||
/*
|
||
* The Q and q formats need special handling to account for the unusual
|
||
* byte ordering of 8-byte floats on Nokia 770 systems, which claim to be
|
||
* little-endian, but also reverse word order.
|
||
*/
|
||
|
||
case 'Q':
|
||
if (TclNokia770Doubles()) {
|
||
return 3;
|
||
}
|
||
return 1;
|
||
case 'q':
|
||
if (TclNokia770Doubles()) {
|
||
return 2;
|
||
}
|
||
return 0;
|
||
#endif
|
||
}
|
||
|
||
Tcl_Panic("unexpected fallthrough");
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* CopyNumber --
|
||
*
|
||
* This routine is called by FormatNumber and ScanNumber to copy a
|
||
* floating-point number. If required, bytes are reversed while copying.
|
||
* The behaviour is only fully defined when used with IEEE float and
|
||
* double values (guaranteed to be 4 and 8 bytes long, respectively.)
|
||
*
|
||
* Results:
|
||
* None
|
||
*
|
||
* Side effects:
|
||
* Copies length bytes
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
CopyNumber(
|
||
const void *from, /* source */
|
||
void *to, /* destination */
|
||
unsigned int length, /* Number of bytes to copy */
|
||
int type) /* What type of thing are we copying? */
|
||
{
|
||
switch (NeedReversing(type)) {
|
||
case 0:
|
||
memcpy(to, from, length);
|
||
break;
|
||
case 1: {
|
||
const unsigned char *fromPtr = from;
|
||
unsigned char *toPtr = to;
|
||
|
||
switch (length) {
|
||
case 4:
|
||
toPtr[0] = fromPtr[3];
|
||
toPtr[1] = fromPtr[2];
|
||
toPtr[2] = fromPtr[1];
|
||
toPtr[3] = fromPtr[0];
|
||
break;
|
||
case 8:
|
||
toPtr[0] = fromPtr[7];
|
||
toPtr[1] = fromPtr[6];
|
||
toPtr[2] = fromPtr[5];
|
||
toPtr[3] = fromPtr[4];
|
||
toPtr[4] = fromPtr[3];
|
||
toPtr[5] = fromPtr[2];
|
||
toPtr[6] = fromPtr[1];
|
||
toPtr[7] = fromPtr[0];
|
||
break;
|
||
}
|
||
break;
|
||
}
|
||
case 2: {
|
||
const unsigned char *fromPtr = from;
|
||
unsigned char *toPtr = to;
|
||
|
||
toPtr[0] = fromPtr[4];
|
||
toPtr[1] = fromPtr[5];
|
||
toPtr[2] = fromPtr[6];
|
||
toPtr[3] = fromPtr[7];
|
||
toPtr[4] = fromPtr[0];
|
||
toPtr[5] = fromPtr[1];
|
||
toPtr[6] = fromPtr[2];
|
||
toPtr[7] = fromPtr[3];
|
||
break;
|
||
}
|
||
case 3: {
|
||
const unsigned char *fromPtr = from;
|
||
unsigned char *toPtr = to;
|
||
|
||
toPtr[0] = fromPtr[3];
|
||
toPtr[1] = fromPtr[2];
|
||
toPtr[2] = fromPtr[1];
|
||
toPtr[3] = fromPtr[0];
|
||
toPtr[4] = fromPtr[7];
|
||
toPtr[5] = fromPtr[6];
|
||
toPtr[6] = fromPtr[5];
|
||
toPtr[7] = fromPtr[4];
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FormatNumber --
|
||
*
|
||
* This routine is called by Tcl_BinaryObjCmd to format a number into a
|
||
* location pointed at by cursor.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* Moves the cursor to the next location to be written into.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
FormatNumber(
|
||
Tcl_Interp *interp, /* Current interpreter, used to report
|
||
* errors. */
|
||
int type, /* Type of number to format. */
|
||
Tcl_Obj *src, /* Number to format. */
|
||
unsigned char **cursorPtr) /* Pointer to index into destination buffer. */
|
||
{
|
||
long value;
|
||
double dvalue;
|
||
Tcl_WideInt wvalue;
|
||
float fvalue;
|
||
|
||
switch (type) {
|
||
case 'd':
|
||
case 'q':
|
||
case 'Q':
|
||
/*
|
||
* Double-precision floating point values. Tcl_GetDoubleFromObj
|
||
* returns TCL_ERROR for NaN, but we can check by comparing the
|
||
* object's type pointer.
|
||
*/
|
||
|
||
if (Tcl_GetDoubleFromObj(interp, src, &dvalue) != TCL_OK) {
|
||
if (src->typePtr != &tclDoubleType) {
|
||
return TCL_ERROR;
|
||
}
|
||
dvalue = src->internalRep.doubleValue;
|
||
}
|
||
CopyNumber(&dvalue, *cursorPtr, sizeof(double), type);
|
||
*cursorPtr += sizeof(double);
|
||
return TCL_OK;
|
||
|
||
case 'f':
|
||
case 'r':
|
||
case 'R':
|
||
/*
|
||
* Single-precision floating point values. Tcl_GetDoubleFromObj
|
||
* returns TCL_ERROR for NaN, but we can check by comparing the
|
||
* object's type pointer.
|
||
*/
|
||
|
||
if (Tcl_GetDoubleFromObj(interp, src, &dvalue) != TCL_OK) {
|
||
if (src->typePtr != &tclDoubleType) {
|
||
return TCL_ERROR;
|
||
}
|
||
dvalue = src->internalRep.doubleValue;
|
||
}
|
||
|
||
/*
|
||
* Because some compilers will generate floating point exceptions on
|
||
* an overflow cast (e.g. Borland), we restrict the values to the
|
||
* valid range for float.
|
||
*/
|
||
|
||
if (fabs(dvalue) > (double)FLT_MAX) {
|
||
fvalue = (dvalue >= 0.0) ? FLT_MAX : -FLT_MAX;
|
||
} else {
|
||
fvalue = (float) dvalue;
|
||
}
|
||
CopyNumber(&fvalue, *cursorPtr, sizeof(float), type);
|
||
*cursorPtr += sizeof(float);
|
||
return TCL_OK;
|
||
|
||
/*
|
||
* 64-bit integer values.
|
||
*/
|
||
case 'w':
|
||
case 'W':
|
||
case 'm':
|
||
if (Tcl_GetWideIntFromObj(interp, src, &wvalue) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (NeedReversing(type)) {
|
||
*(*cursorPtr)++ = (unsigned char) wvalue;
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 8);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 16);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 24);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 32);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 40);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 48);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 56);
|
||
} else {
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 56);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 48);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 40);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 32);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 24);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 16);
|
||
*(*cursorPtr)++ = (unsigned char) (wvalue >> 8);
|
||
*(*cursorPtr)++ = (unsigned char) wvalue;
|
||
}
|
||
return TCL_OK;
|
||
|
||
/*
|
||
* 32-bit integer values.
|
||
*/
|
||
case 'i':
|
||
case 'I':
|
||
case 'n':
|
||
if (TclGetLongFromObj(interp, src, &value) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (NeedReversing(type)) {
|
||
*(*cursorPtr)++ = (unsigned char) value;
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 16);
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 24);
|
||
} else {
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 24);
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 16);
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
||
*(*cursorPtr)++ = (unsigned char) value;
|
||
}
|
||
return TCL_OK;
|
||
|
||
/*
|
||
* 16-bit integer values.
|
||
*/
|
||
case 's':
|
||
case 'S':
|
||
case 't':
|
||
if (TclGetLongFromObj(interp, src, &value) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (NeedReversing(type)) {
|
||
*(*cursorPtr)++ = (unsigned char) value;
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
||
} else {
|
||
*(*cursorPtr)++ = (unsigned char) (value >> 8);
|
||
*(*cursorPtr)++ = (unsigned char) value;
|
||
}
|
||
return TCL_OK;
|
||
|
||
/*
|
||
* 8-bit integer values.
|
||
*/
|
||
case 'c':
|
||
if (TclGetLongFromObj(interp, src, &value) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
*(*cursorPtr)++ = (unsigned char) value;
|
||
return TCL_OK;
|
||
|
||
default:
|
||
Tcl_Panic("unexpected fallthrough");
|
||
return TCL_ERROR;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ScanNumber --
|
||
*
|
||
* This routine is called by Tcl_BinaryObjCmd to scan a number out of a
|
||
* buffer.
|
||
*
|
||
* Results:
|
||
* Returns a newly created object containing the scanned number. This
|
||
* object has a ref count of zero.
|
||
*
|
||
* Side effects:
|
||
* Might reuse an object in the number cache, place a new object in the
|
||
* cache, or delete the cache and set the reference to it (itself passed
|
||
* in by reference) to NULL.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static Tcl_Obj *
|
||
ScanNumber(
|
||
unsigned char *buffer, /* Buffer to scan number from. */
|
||
int type, /* Format character from "binary scan" */
|
||
int flags, /* Format field flags */
|
||
Tcl_HashTable **numberCachePtrPtr)
|
||
/* Place to look for cache of scanned
|
||
* value objects, or NULL if too many
|
||
* different numbers have been scanned. */
|
||
{
|
||
long value;
|
||
float fvalue;
|
||
double dvalue;
|
||
Tcl_WideUInt uwvalue;
|
||
|
||
/*
|
||
* We cannot rely on the compiler to properly sign extend integer values
|
||
* when we cast from smaller values to larger values because we don't know
|
||
* the exact size of the integer types. So, we have to handle sign
|
||
* extension explicitly by checking the high bit and padding with 1's as
|
||
* needed. This practice is disabled if the BINARY_UNSIGNED flag is set.
|
||
*/
|
||
|
||
switch (type) {
|
||
case 'c':
|
||
/*
|
||
* Characters need special handling. We want to produce a signed
|
||
* result, but on some platforms (such as AIX) chars are unsigned. To
|
||
* deal with this, check for a value that should be negative but
|
||
* isn't.
|
||
*/
|
||
|
||
value = buffer[0];
|
||
if (!(flags & BINARY_UNSIGNED)) {
|
||
if (value & 0x80) {
|
||
value |= -0x100;
|
||
}
|
||
}
|
||
goto returnNumericObject;
|
||
|
||
/*
|
||
* 16-bit numeric values. We need the sign extension trick (see above)
|
||
* here as well.
|
||
*/
|
||
|
||
case 's':
|
||
case 'S':
|
||
case 't':
|
||
if (NeedReversing(type)) {
|
||
value = (long) (buffer[0] + (buffer[1] << 8));
|
||
} else {
|
||
value = (long) (buffer[1] + (buffer[0] << 8));
|
||
}
|
||
if (!(flags & BINARY_UNSIGNED)) {
|
||
if (value & 0x8000) {
|
||
value |= -0x10000;
|
||
}
|
||
}
|
||
goto returnNumericObject;
|
||
|
||
/*
|
||
* 32-bit numeric values.
|
||
*/
|
||
|
||
case 'i':
|
||
case 'I':
|
||
case 'n':
|
||
if (NeedReversing(type)) {
|
||
value = (long) (buffer[0]
|
||
+ (buffer[1] << 8)
|
||
+ (buffer[2] << 16)
|
||
+ (((long)buffer[3]) << 24));
|
||
} else {
|
||
value = (long) (buffer[3]
|
||
+ (buffer[2] << 8)
|
||
+ (buffer[1] << 16)
|
||
+ (((long)buffer[0]) << 24));
|
||
}
|
||
|
||
/*
|
||
* Check to see if the value was sign extended properly on systems
|
||
* where an int is more than 32-bits.
|
||
* We avoid caching unsigned integers as we cannot distinguish between
|
||
* 32bit signed and unsigned in the hash (short and char are ok).
|
||
*/
|
||
|
||
if (flags & BINARY_UNSIGNED) {
|
||
return Tcl_NewWideIntObj((Tcl_WideInt)(unsigned long)value);
|
||
}
|
||
if ((value & (((unsigned int)1)<<31)) && (value > 0)) {
|
||
value -= (((unsigned int)1)<<31);
|
||
value -= (((unsigned int)1)<<31);
|
||
}
|
||
|
||
returnNumericObject:
|
||
if (*numberCachePtrPtr == NULL) {
|
||
return Tcl_NewLongObj(value);
|
||
} else {
|
||
register Tcl_HashTable *tablePtr = *numberCachePtrPtr;
|
||
register Tcl_HashEntry *hPtr;
|
||
int isNew;
|
||
|
||
hPtr = Tcl_CreateHashEntry(tablePtr, INT2PTR(value), &isNew);
|
||
if (!isNew) {
|
||
return (Tcl_Obj *) Tcl_GetHashValue(hPtr);
|
||
}
|
||
if (tablePtr->numEntries <= BINARY_SCAN_MAX_CACHE) {
|
||
register Tcl_Obj *objPtr = Tcl_NewLongObj(value);
|
||
|
||
Tcl_IncrRefCount(objPtr);
|
||
Tcl_SetHashValue(hPtr, (ClientData) objPtr);
|
||
return objPtr;
|
||
}
|
||
|
||
/*
|
||
* We've overflowed the cache! Someone's parsing a LOT of varied
|
||
* binary data in a single call! Bail out by switching back to the
|
||
* old behaviour for the rest of the scan.
|
||
*
|
||
* Note that anyone just using the 'c' conversion (for bytes)
|
||
* cannot trigger this.
|
||
*/
|
||
|
||
DeleteScanNumberCache(tablePtr);
|
||
*numberCachePtrPtr = NULL;
|
||
return Tcl_NewLongObj(value);
|
||
}
|
||
|
||
/*
|
||
* Do not cache wide (64-bit) values; they are already too large to
|
||
* use as keys.
|
||
*/
|
||
|
||
case 'w':
|
||
case 'W':
|
||
case 'm':
|
||
if (NeedReversing(type)) {
|
||
uwvalue = ((Tcl_WideUInt) buffer[0])
|
||
| (((Tcl_WideUInt) buffer[1]) << 8)
|
||
| (((Tcl_WideUInt) buffer[2]) << 16)
|
||
| (((Tcl_WideUInt) buffer[3]) << 24)
|
||
| (((Tcl_WideUInt) buffer[4]) << 32)
|
||
| (((Tcl_WideUInt) buffer[5]) << 40)
|
||
| (((Tcl_WideUInt) buffer[6]) << 48)
|
||
| (((Tcl_WideUInt) buffer[7]) << 56);
|
||
} else {
|
||
uwvalue = ((Tcl_WideUInt) buffer[7])
|
||
| (((Tcl_WideUInt) buffer[6]) << 8)
|
||
| (((Tcl_WideUInt) buffer[5]) << 16)
|
||
| (((Tcl_WideUInt) buffer[4]) << 24)
|
||
| (((Tcl_WideUInt) buffer[3]) << 32)
|
||
| (((Tcl_WideUInt) buffer[2]) << 40)
|
||
| (((Tcl_WideUInt) buffer[1]) << 48)
|
||
| (((Tcl_WideUInt) buffer[0]) << 56);
|
||
}
|
||
if (flags & BINARY_UNSIGNED) {
|
||
Tcl_Obj *bigObj = NULL;
|
||
mp_int big;
|
||
|
||
TclBNInitBignumFromWideUInt(&big, uwvalue);
|
||
bigObj = Tcl_NewBignumObj(&big);
|
||
return bigObj;
|
||
}
|
||
return Tcl_NewWideIntObj((Tcl_WideInt) uwvalue);
|
||
|
||
/*
|
||
* Do not cache double values; they are already too large to use as
|
||
* keys and the values stored are utterly incompatible with the
|
||
* integer part of the cache.
|
||
*/
|
||
|
||
/*
|
||
* 32-bit IEEE single-precision floating point.
|
||
*/
|
||
|
||
case 'f':
|
||
case 'R':
|
||
case 'r':
|
||
CopyNumber(buffer, &fvalue, sizeof(float), type);
|
||
return Tcl_NewDoubleObj(fvalue);
|
||
|
||
/*
|
||
* 64-bit IEEE double-precision floating point.
|
||
*/
|
||
|
||
case 'd':
|
||
case 'Q':
|
||
case 'q':
|
||
CopyNumber(buffer, &dvalue, sizeof(double), type);
|
||
return Tcl_NewDoubleObj(dvalue);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DeleteScanNumberCache --
|
||
*
|
||
* Deletes the hash table acting as a scan number cache.
|
||
*
|
||
* Results:
|
||
* None
|
||
*
|
||
* Side effects:
|
||
* Decrements the reference counts of the objects in the cache.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DeleteScanNumberCache(
|
||
Tcl_HashTable *numberCachePtr)
|
||
/* Pointer to the hash table, or NULL (when
|
||
* the cache has already been deleted due to
|
||
* overflow.) */
|
||
{
|
||
Tcl_HashEntry *hEntry;
|
||
Tcl_HashSearch search;
|
||
|
||
if (numberCachePtr == NULL) {
|
||
return;
|
||
}
|
||
|
||
hEntry = Tcl_FirstHashEntry(numberCachePtr, &search);
|
||
while (hEntry != NULL) {
|
||
register Tcl_Obj *value = Tcl_GetHashValue(hEntry);
|
||
|
||
if (value != NULL) {
|
||
Tcl_DecrRefCount(value);
|
||
}
|
||
hEntry = Tcl_NextHashEntry(&search);
|
||
}
|
||
Tcl_DeleteHashTable(numberCachePtr);
|
||
}
|
||
|
||
/*
|
||
* Local Variables:
|
||
* mode: c
|
||
* c-basic-offset: 4
|
||
* fill-column: 78
|
||
* End:
|
||
*/
|